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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7ab2ad66e71dc4bda0f479beac8a03f9823b5e9d9442e94ca5cade2a7f48c0' 
  AND token = 'e3DH/00yb6vc8dDX9QdtNAoplwbHMq4pnNirpVBXOFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}